From d9b245f4db6df803b96b8431a660ba14078ec6bd Mon Sep 17 00:00:00 2001
From: Mark Wooding <mdw@distorted.org.uk>
Date: Sun, 21 Dec 2008 20:20:47 +0000
Subject: [PATCH] auto-version: Separate out version deduction magic.

This is useful in simpler non-Autoconf projects, so put the magic in
a script.
---
 Makefile.am     |  11 ++++++
 aclocal.glob    |  20 +++++------
 auto-version.in | 102 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 121 insertions(+), 12 deletions(-)
 create mode 100755 auto-version.in

diff --git a/Makefile.am b/Makefile.am
index 7ca039d..86b4fb0 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -95,6 +95,17 @@ confsubst: confsubst.in Makefile
 	chmod +x $@.new
 	mv $@.new $@
 
+## auto-version
+pkgdata_SCRIPTS		+= auto-version
+CLEANFILES		+= auto-version
+EXTRA_DIST		+= auto-version.in
+
+auto-version: auto-version.in Makefile
+	$(confsubst) $(srcdir)/auto-version.in >$@.new \
+		VERSION=$(VERSION)
+	chmod +x $@.new
+	mv $@.new $@
+
 ## Testsuites.
 pkgdata_DATA		+= autotest.am
 pkgdata_DATA		+= testsuite.at
diff --git a/aclocal.glob b/aclocal.glob
index 0f5a661..eb0e4d0 100644
--- a/aclocal.glob
+++ b/aclocal.glob
@@ -38,18 +38,14 @@ dnl 		version number, worked out in some clever way.
 
 AC_DEFUN([mdw_AUTO_VERSION], [nobody cares...])
 m4_define([mdw_AUTO_VERSION], [m4_define([AUTO_VERSION], m4_esyscmd([
-  if test -d .git && version=$(git describe --abbrev=4 2>/dev/null); then
-    case "$(git diff-index --name-only HEAD)" in
-      "") ;; *) version="$version+" ;;
-    esac
-  elif cat RELEASE 2>/dev/null; then
-    version=$(cat RELEASE)
-  elif test -f debian/changelog; then
-    version=$(sed -n '/^.*(\(.*\)).*$/ { s::\1:p; q; }' debian/changelog)
-  else
-    echo UNKNOWN
-  fi
-  echo -n $version
+  ver=UNKNOWN
+  for pre in ./ config/; do
+    for post in "" .in; do
+      try=${pre}auto-version${post}
+      if test -x $try; then ver=$("$try"); break; fi
+    done
+  done
+  echo -n "$ver"
 ]))])
 
 dnl --- *@-mdw_LIBTOOL_VERSION_INFO-@* ---
diff --git a/auto-version.in b/auto-version.in
new file mode 100755
index 0000000..c9b1e27
--- /dev/null
+++ b/auto-version.in
@@ -0,0 +1,102 @@
+#! /bin/sh
+### -*-sh-*-
+###
+### Make autoconf-like substitutions in files
+###
+### (c) 2008 Mark Wooding
+###
+
+###----- Licensing notice ---------------------------------------------------
+###
+### This file is part of the Common Files Distribution (`common').
+###
+### `Common' is free software; you can redistribute it and/or modify
+### it under the terms of the GNU General Public License as published by
+### the Free Software Foundation; either version 2 of the License, or
+### (at your option) any later version.
+###
+### `Common' is distributed in the hope that it will be useful,
+### but WITHOUT ANY WARRANTY; without even the implied warranty of
+### MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+### GNU General Public License for more details.
+###
+### You should have received a copy of the GNU General Public License
+### along with `common'; if not, write to the Free Software Foundation,
+### Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+set -e
+VERSION="@VERSION@"
+
+###--------------------------------------------------------------------------
+### Parse command line arguments.
+
+while [ $# -gt 0 ]; do
+  case $1 in
+    -h | --h | --he | --hel | --help)
+      cat <<EOF
+Usage: auto-verison
+
+Writes on standard output the program's version number.
+EOF
+      exit 0
+      ;;
+    -v | --v | --ve | --ver | --vers | --versi | --versio | --version)
+      echo "auto-version: Common Files Distribution version $VERSION"
+      exit 0
+      ;;
+    --)
+      shift
+      break
+      ;;
+    -)
+      break
+      ;;
+    -*)
+      echo "auto-version: unknown option \`$1'" >&2
+      exit 1
+      ;;
+    *)
+      break
+      ;;
+  esac
+  shift
+done
+
+if [ $# -ne 0 ]; then
+  echo >&2 "Usage: auto-version"
+  exit 1
+fi
+
+###--------------------------------------------------------------------------
+### Main program.
+
+## If this is a Git checkout then Git should be able to identify the version.
+if [ -d .git ] && version=$(git describe --abbrev=4 2>/dev/null); then
+
+  ## If the working tree is dirty, indicate with a `+'.
+  case "$(git diff-index --name-only HEAD)" in
+    "") ;;
+    *) version="$version+" ;;
+  esac
+  echo "$version"
+  exit 0
+fi
+
+## If this was unpacked from a source distribution, the RELEASE file sould
+## say what the version was.
+if [ -f RELEASE ]; then
+  cat RELEASE
+  exit 0
+fi
+
+## If we're Debianized, then the Debian changelog ought to know.
+if [ -f debian/changelog ]; then
+  sed -n '/^.*(\(.*\)).*$/ { s::\1:p; q; }' debian/changelog
+  exit 0
+fi
+
+## Otherwise we're screwed.
+echo UNKNOWN
+exit 0
+
+###----- That's all, folks --------------------------------------------------
-- 
2.11.0